Executive summary about coil shock suspensions by John Willis
Austrian motorcycle maker, KTM makes the KTM SX 65 as a starter bike for kids, isn't a low-tech mini-bike. It's equipped with modern, inverted front suspension and a single rear coil-over shock, giving it plenty of travel.
It's a lot cheaper than replacing the stanchion due to stanchion damage. Often called a "Mono-Shock," which is Yamaha's trademark for the single-shock rear suspension, the single rear coil-over is a modern suspension system. The coil-over shock is also a high-tech suspension cartridge.
The KTM's front and rear suspension, in concert, provide significant "travel." It is a high-performance child's bike, appropriate for children approximately 8 to 12 years old, can accommodate an advanced rider.